| ITRC Benefits in
State Applies ITRC Experience with Natural Attenuation and In Situ Bioremediation at Four Sites
1. Natural Attenuation of Chlorinated Solvents at a Landfill
The landfill was contaminated with low levels of chlorinated solvents. The KDHE project manager had limited experience with remediation by natural attenuation. She asked Randy Farr for help evaluating the proposal, because of his experience with ITRC and RTDF involving Natural Attenuation. As a result they were able to establish that the data in the proposal was sufficient to confirm that Natural Attenuation was occurring at the site and that it was therefore a potentially good candidate for a pilot. However, their review also identified a number of elements, not included in the proposal, which needed to be added in order to assure that the pilot produced adequate performance information and accurate measurements to assure KDHE that Natural Attenuation was working and leading to an acceptable end state. The pilot's sponsor agreed to these additions -- they were included in the pilot.
Benefits: This was the first Natural attenuation pilot for chlorinated solvents approved by the KDHE Assessment and Restoration Section. Having the ITRC/RTDF documents and expertise available provided the knowledge and confidence KDHE staff needed to evaluate, amend and approve the proposal. It sped up the review process by at least 2 weeks, and possibly prevented the proposal from being turned down. It also avoided consumption of significant KDHE staff time that might otherwise have been needed to evaluate other proposals for cleanup on this site.
2. Natural Attenuation of a Chlorinated Solvent plume at an Army Base
Based on his expertise on Natural Attenuation acquired via ITRC/RTDF experience, access to guidance documents and network of experts, Randy was able to conclude with confidence that biodegradation was not going to work at this site and the plume would continue to migrate offsite impacting the water supply from existing wells.
Benefits: The KDHE program manager was able to get rapid access to knowledgeable advice and assistance in evaluating the proposal. This reduced time and expense to conduct the review and provided a sound technical basis for KDHE to reject the proposal. By being able to effectively evaluate the Natural Attenuation potential at this site and give the Army a timely and technically credible response, the likelihood of additional Natural Attenuation proposals for this site was preempted -- saving both organizations time and money.
3. Active In-Situ Bioremediation of Groundwater
A portion of one of the projects (intended for enhanced anaerobic biodegradation of chlorinated solvents through injection of nutrient and substrate amendments) was allowed to go forward. The two proposals involving aerobic biodegradation of PCE's were rejected. This decision was based in part on information KDHE gained from their involvement with the RTDF in-situ bioremediation projects at Dover AFB, the RTDF-ITRC training and guidance document, and conversations with RTDF personnel.
4. Anaerobic Bioventing Pilot
Benefits: If this pilot is successful it will significantly improve the available opportunities in Kansas to clean up dry cleaning sites. The alternative method -- excavating the soil and treating it off site -- is too expensive and often impractical since the contaminated soil is under buildings. Consequently, the ITRC in situ bioremediation activities may ultimately lead to greater environmental protection at lower cost for dealing with contaminated dry cleaning sites throughout the state of Kansas.
Savings included less KDHE staff time to review and approve or reject remediation proposals. Less time for project sponsors to get informed and definitive decisions from KDHE. Increased potential for new technologies to be approved for use in Kansas -- when new approaches are determined to be viable and appropriate at specific sites. Reduced chance that new technologies will be attempted under circumstances where they are likely to fail --wasting all involved parties time, money, and credibility.
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